cli: add autocompletion and dynamic help doc
cli: add autocompletion and dynamic help doc

- autocompletions for help docs
- more verbose doc strings with __doc__ import from the module and list of
  required args and all args

Signed-off-by: Rohit Yadav <0fa72ca37c4b5fa62675187ce32ea6c9f842fd52@apache.org>

apache/cloudstack-cloudmonkey,Interoute/cloudmonkey-interoute,apache/cloudstack-cloudmonkey,remibergsma/cloudstack-cloudmonkey,remibergsma/cloudstack-cloudmonkey,Interoute/cloudmonkey-interoute